Check out free ebooks from Story Share

We help generate and then distribute new stories aimed at older students who read below grade level, specifically ensuring that the content is interesting at their age, and readable at their level.

To do so, we are building the Story Shares Hub to bring together authors, readers, and educators. For authors, the Hub provides a digital book builder to guide the creation of just-right content, and access to a large group of potential readers. For readers and educators, the Hub provides a library of newly created just-right content, distributed on a platform with built-in reading assists to make it even more approachable.

Source: Story Shares | Books

This looks like a great resource for finding content for readers. You can’t download the ebooks, so you have to read them online. Each book does have a built in reader, so the browser will read the book to the reader, which is pretty cool.